Smartphone holder



FIG. 1 is a front right perspective view illustrating the new design for a smartphone holder;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line showing of structure is included for the purpose of illustrating portions of the “article” and forms no part of the claimed design. 

CLAIM The ornamental design for a smartphone holder, as shown and described. 